Method 1 Using a plugin

First install vue-plugin-load-script via npm or yarn

npm install --save vue-plugin-load-script

In main.js add

import LoadScript from 'vue-plugin-load-script';

Vue.use(LoadScript);

Vue.loadScript(scriptUrl)
 .then(() => {
   // Script is loaded, do something
 })
 .catch(() => {
   // Failed to fetch script
 });

Thank you @halilcakar for mentioning this method. I didn’t know about this plugin until you showed it off.

Method 2 Implementing manually

mounted() {
    //script already loaded exit
    if (document.getElementById('external-source-script')) return;

    //Create script tag
    let script = document.createElement('script')
    script.setAttribute('src', 'your-external-source') // <---------------
    script.setAttribute('type', 'text/javascript')
    script.setAttribute('id', 'external-source-script')
 
    //Add external script dependency 
    document.head.appendChild(script)
}


beforeDestroy() {
    //Remove the external source
    let el = document.getElementById('external-source-script')
    if (el) el.remove();
}